REMOVAL OF COLOUR COMPOUNDS IN SUGARCANE JUICE BY MODIFIED SUGARCANE BAGASSE: EQUILIBRIUM AND KINETIC STUDY

摘要

The adsorption performance of colour compounds in sugar juice was investigated using the modified sugarcane bagasse as adsorbent in this study. The adsorption of colour compounds was investigated as different operating conditions including adsorbent dosage, pH and contact time. Three kinetics models and two isotherms were applied to describe the adsorption process and evaluate the adsorption equilibrium, respectively. Results showed that the adsorption parameters were optimized as adsorbent dosage of 0.05 g/mL, pH of 5 and the contract time of 30 min, which yielded 59.18% of decolorization rate. Study of adsorption kinetics indicated that the process followed the pseudo-second-order chemisorption model. The adsorption behavior was well described by the Freundlich isotherm model, showing a multilayer capacity for colour compounds. Moreover, the regeneration studies showed the adsorbent had a good reuse performance over several regeneration cycles. These results suggest that the modified sugarcane bagasse is an inexpensive and efficient adsorbent, which has potential application for removing colour compounds from sugar juice.